(function(){  
 jQuery.fn.menuover = function() {  
 	
	var menu_items=$(this);

    return menu_items.each(function() {  
		menu_item = $(this);
		if(menu_item.hasClass('current_menu_item'))
			return;
		var off_filename = menu_item.attr('src');
		var off_filename_array = off_filename.split('.');
		var off_prefix = off_filename_array[0];
		var off_suffix = off_filename_array[1];
		var on_filename = off_prefix + "-on." + off_suffix;
		menu_item.attr('src', on_filename);
    });  
 };  
})(jQuery);